Cold sores, also known as fever blisters and Herpes labialis, are very common. When they occur, usually appear as groups of blisters in patches. And once they pop, they can form scabs lasting several days. These spread by close contact such as k1ss1ng and are caused by HSV-1 and less commonly by HSV-2. They can be contagious even if you don’t see the sores. Signs and symptoms vary, depending on whether this is your first outbreak or a recurrence. Recurrences typically appear at the same spot each time and tend to be less severe than the first outbreak. Once you've had an episode of herpes infection, the virus lies dormant in nerve cells and may emerge as another cold sore at the same place as before. Recurrence may be triggered by: 1. Viral infection or fever 2. Hormonal changes, such as those related to menstruation 3. Stress 4. Fatigue 5. Exposure to sunlight and wind 6. Changes in the immune system 7. Trauma to the skin There is currently no cure for cold sores but ther...